Verify Webhook Signatures | Cashfree Payments

Verify webhook signatures to ensure payloads from Cashfree haven’t been tampered with. This security measure prevents fraudulent notifications and protects your application from malicious attacks. Essential for production environments: all merchants processing live payments, subscriptions, or marketplace transactions must implement signature verification to maintain security and prevent financial losses.

Cashfree generates the webhook signature based on the raw payload, not the parsed payload. You can refer to how the popular JavaScript framework NestJS provides a hook for accessing the raw body.

Use the signature to verify that the request hasn’t been tampered with. You need your Cashfree PG secret key and the payload to verify the signature.

For partner webhooks, use the partner API key.

The timestamp is present in the header x-webhook-timestamp.
The actual signature is present in the header x-webhook-signature.

signature-verification

timestamp := 1617695238078;
signedPayload := $timestamp.$payload;
expectedSignature := Base64Encode(HMACSHA256($signedPayload, $merchantSecretKey));

SDK verification (built-in approach)

var express = require('express')
const { Cashfree, CFEnvironment } = require "cashfree-pg";

var app = express()

const cashfree = new Cashfree(
CFEnvironment.SANDBOX,
"{Client ID}",
"{Client Secret Key}"
);

app.post('/webhook', function (req, res) {
try {
cashfree.PGVerifyWebhookSignature(req.headers["x-webhook-signature"], req.rawBody, req.headers["x-webhook-timestamp"])
} catch (err) {
console.log(err.message)
}
})

import (
  cashfree "github.com/cashfree/cashfree-pg/v4"
)

// Route
e.POST("/webhook", _this.Webhook)

// Controller
func (_this *WebhookRoute) Webhook(c echo.Context) error {
  	clientId := "<x-client-id>"
		clientSecret := "<x-client-secret>"
		cashfree.XClientId = &clientId
		cashfree.XClientSecret = &clientSecret
		cashfree.XEnvironment = cashfree.SANDBOX

    signature := c.Request().Header.Get("x-webhook-signature")
    timestamp := c.Request().Header.Get("x-webhook-timestamp")

    body, _ := ioutil.ReadAll(c.Request().Body)
    rawBody := string(body)
    webhookEvent, err := cashfree.PGVerifyWebhookSignature(signature, rawBody, timestamp)
    if err != nil {
		fmt.Println(err.Error())
	} else {
		fmt.Println(webhookEvent.Object)
	}
}

<?php

$inputJSON = file_get_contents('php://input');

$expectedSig = getallheaders()['x-webhook-signature'];
$ts = getallheaders()['x-webhook-timestamp'];

if(!isset($expectedSig) || !isset($ts)){
    echo "Bad Request";
    die();
}

\Cashfree\Cashfree::$XClientId = "<x-client-id>";
\Cashfree\Cashfree::$XClientSecret = "<x-client-secret>";
$cashfree = new \Cashfree\Cashfree();

try {
 $response =  cashfree->PGVerifyWebhookSignature($expectedSig, $inputJSON, $ts);
} catch(Exception $e) {
  // Error if signature verification fails
}
?>

from cashfree_pg.api_client import Cashfree

@app.route('/webhook', methods = ['POST'])
def disp():
		# Get the raw body from the request
    raw_body = request.data

    # Decode the raw body bytes into a string
    decoded_body = raw_body.decode('utf-8')

    #verify_signature
    timestamp = request.headers['x-webhook-timestamp']
    signature = request.headers['x-webhook-signature']

		cashfree = Cashfree()
		cashfree.XClientId = "<app_id>"
		cashfree.XClientSecret = "<secret_key>"
		try:
			cashfreeWebhookResponse = cashfree.PGVerifyWebhookSignature(signature, decoded_body, timestamp)
		except:
			# If Signature mis-match

import com.cashfree.*;

@PostMapping("/my-endpoint")
public String handlePost(HttpServletRequest request) throws IOException {
    Cashfree.XClientId = "<x-client-id>";
		Cashfree.XClientSecret = "<x-client-secret>";
		Cashfree.XEnvironment = Cashfree.SANDBOX;

  	StringBuilder stringBuilder = new StringBuilder();
    BufferedReader bufferedReader = null;

    try {
      bufferedReader = request.getReader();
      String line;
      while ((line = bufferedReader.readLine()) != null) {
              stringBuilder.append(line).append('\n');
      }


      String rawBody = stringBuilder.toString();
      String signature = request.getHeader("x-webhook-signature");
      String timestamp = request.getHeader("x-webhook-timestamp");

      Cashfree cashfree = new Cashfree();
      PGWebhookEvent webhook = cashfree.PGVerifyWebhookSignature(signature, rawBody, timestamp);

    } catch (Exception e) {
            // Error if verification fails
    } finally {
         if (bufferedReader != null) {
            bufferedReader.close();
		}
	}

}

using cashfree_pg.Client;
using cashfree_pg.Model;


		[Route("api/[controller]")]
    [ApiController]
    public class YourController : ControllerBase
    {
        [HttpPost]
        public async Task<IActionResult> Post()
        {
            // Read the raw body of the POST request
            using (StreamReader reader = new StreamReader(Request.Body, Encoding.UTF8))
            {
                string requestBody = await reader.ReadToEndAsync();
                var headers = Request.Headers;
                var signature = headers["x-webhook-signature"];
                var timestamp = headers["x-webhook-timestamp"];

                Cashfree.XClientId = "<x-client-id>";
                Cashfree.XClientSecret = "<x-client-secret>";
                Cashfree.XEnvironment = Cashfree.SANDBOX;
								var cashfree = new Cashfree();

                try {
                var response = cashfree.PGVerifyWebhookSignature(signature, requestBody, timestamp);
                } catch(Exception e) {
                // Error if signature mis matches
                }
            }
        }
    }

Manual verification (custom approach)

function verify(ts, request){
    const body = request.headers['x-webhook-timestamp'] + request.rawBody
    const secretKey = <client secret>;
    let generatedSignature = crypto.createHmac('sha256', secretKey).update(body).digest("base64");
    const signature = request.headers['x-webhook-signature']
    if(generatedSignature === signature) {
        let jsonObject = JSON.parse(rawBody)
        return jsonObject
    }
    throw new Error("Generated signature and received signature did not match.");
}

func VerifySignature(expectedSig string, ts string, body string) (string, error) {
        clientSecret := "<client-secret>"
	signatureString := ts + rawBody
	hmacInstance := hmac.New(sha256.New, []byte(*clientSecret))
	hmacInstance.Write([]byte(signatureString))
	bytesData := hmacInstance.Sum(nil)
	generatedSignature := base64.StdEncoding.EncodeToString(bytesData)
	if generatedSignature == expectedSig {
		var object interface{}
		err := json.Unmarshal([]byte(rawBody), &object)
		if err != nil {
			return nil, errors.New("something went wrong when unmarshalling raw body")
		}
		if objectAsMapInterface, ok := object.(map[string]interface{}); ok {
			if webhookType, ok := objectAsMapInterface["type"].(string); ok {
				return "signatures match", nil
			}
		}
		return "", nil
	}
	return nil, errors.New("generated signature and received signature did not match")
}

timestamp := c.Request().Header.Get("x-webhook-timestamp")
body, _ := ioutil.ReadAll(c.Request().Body)
rawBody := string(body)
signature := c.Request().Header.Get("x-webhook-signature")

VerifySignature(signature, timestamp, rawBody)

function computeSignature($ts, $rawBody){
    $rawBody = file_get_contents('php://input');
    $timestamp = getallheaders()['x-webhook-timestamp'];
    $signature = getallheaders()['x-webhook-signature'];

    $body = $timestamp . $rawBody;
    $secretKey = "<client-secret>";
    $genSignature = hash_hmac('sha256', $body, $secretKey, true);
    $genSignatureBase64 = base64_encode($genSignature);
    if($genSignatureBase64 == $signature) {
        $jsonResponse = json_decode($rawBody);
        return $jsonResponse;
    }
    throw new Exception("Generated signature and received signature did not match.");
}

public Object generateSignature() {
  try {
      String data = headers.get("x-webhook-timestamp") + rawBody;
      String secretKey = "<client-secret>";
      Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
      SecretKeySpec secret_key_spec = new SecretKeySpec(secretKey.getBytes(), "HmacSHA256");
      sha256_HMAC.init(secret_key_spec);
      String computed_signature = Base64.getEncoder().encodeToString(sha256_HMAC.doFinal(data.getBytes()));
      String signature = headers.get("x-webhook-signature")
      if(computed_signature.equals(signature)) {
        Gson g = new Gson();
        Object response = g.fromJson(rawBody, Object.class);
        return response;
      }
      throw new Exception("Generated signature and received signature did not match.");
  } catch (Exception e) {
    throw e;
  }
}

import base64
import hashlib
import hmac

def generateSignature():
    raw_body = request.data
    timestamp = request.headers['x-webhook-timestamp']
    signature = request.headers['x-webhook-signature']
    signatureData = timestamp+rawBody
    message = bytes(signatureData, 'utf-8')
    secretkey=bytes("<client-signature>",'utf-8')
    generatedSignature = base64.b64encode(hmac.new(secretkey, message, digestmod=hashlib.sha256).digest())
    computed_signature = str(generatedSignature, encoding='utf8')
    if computed_signature == signature:
        json_response = json.loads(rawBody)
        return json_response
    raise Exception("Generated signature and received signature did not match.")

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Webhook Signature Verification

SDK verification (built-in approach)

Manual verification (custom approach)

​SDK verification (built-in approach)

​Manual verification (custom approach)

SDK verification (built-in approach)

Manual verification (custom approach)